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I can see how this wouldn’t be covered in an undergrad cs education. I took only a single computer architecture class which was extremely limited in scope. The only reason I knew about vectorization during undergrad is because a friend mentioned it to me once.

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The basic speed up will not even be because of vectorisation. It will be because of caches.

Are you saying that the majority of the speed up is from caches and then there's a secondary, much smaller, speed up from the vectorization? Or are you saying all the speed up is from caches and I'm off base here with vectorization.

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